You might be downloading any big file and want to just turn off display of your windows 11 laptop or PC display without sleep. Then check below simple tutorial to get it done.
Go to the battery icon and press the right click.
Click on the screen and sleep option.
Select time opposite: turn of my screen after.
If you want to make sure your laptop screen never turns of then click on time section and you can change from 10 minutes, 3 hours etc, to never.